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ESB-2015.2564 - [Cisco] Cisco UCS B-Series Blade Servers: Denial of service - Existing account

Date: 09 October 2015

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2564
     Cisco UCS B-Series Blade Servers Denial of Service Vulnerability
                              9 October 2015

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco UCS B-Series Blade Servers
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-4265  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151006-ucs

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Security Advisory

Cisco UCS B-Series Blade Servers Denial of Service Vulnerability

Medium

Advisory ID: cisco-sa-20151006-ucs

Published: 2015 October 6 21:00 GMT

Version 1.0: Final

CVSS Score: Base - 4.9

Workarounds: Yes

Cisco Bug IDs: CSCuq77241 CVE-2015-4265 CWE-399

Summary

    A vulnerability in Cisco Unified Computing System (UCS) B-Series blade 
    servers could allow an unauthenticated, local attacker to cause the host 
    operating system or Baseboard Management Controller (BMC) to hang.

    The vulnerability is due to how the various components communicate across
    the Inter-IC (I2C) bus. An attacker could exploit this vulnerability by 
    sending specific I2C packets. An exploit could allow the attacker to cause 
    disruption to the host, resulting in a denial of service (DoS) condition.

    Cisco has released software updates that address this vulnerability. 
    Workarounds that mitigate this vulnerability are available. This advisory is 
    available at the following link:

    
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151006-ucs

Affected Products

    Vulnerable Products

    The following Cisco UCS B-Series blade servers running Cisco UCS B-Series
    Blade Server Software prior to release 2.2.6 are vulnerable:

        Cisco UCS B200 M3 Blade Server

        Cisco UCS B420 M3 Blade Server

        Cisco UCS B22 M3 Blade Server

        Cisco UCS B260 M4 Blade Server

        Cisco UCS B460 M4 Blade Server

    Products Confirmed Not Vulnerable

        No other Cisco products are currently known to be affected by this 
        vulnerability.

Workarounds

    If connection to the Cisco Integrated Management Controller (CIMC) is 
    alive, resetting the blade power will recover the blade. If CIMC is in a 
    unresponsive "hanging" state or resetting blade power does not resolve the 
    issue, resetting the slot will recover the blade.

Fixed Software

    When considering software upgrades, customers are advised to consult the 
    Cisco Security Advisories and Responses archive at 
    http://www.cisco.com/go/psirt and review subsequent advisories to determine 
    exposure and a complete upgrade solution.

    In all cases, customers should ensure that the devices to be upgraded 
    contain sufficient memory and confirm that current hardware and software 
    configurations will continue to be supported properly by the new release. If 
    the information is not clear, customers are advised to contact the Cisco 
    Technical Assistance Center (TAC) or their contracted maintenance providers.

Exploitation and Public Announcements

    The Cisco Product Security Incident Response Team (PSIRT) is not aware of
    any public announcements or malicious use of the vulnerability that is 
    described in this advisory.

URL

    
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151006-ucs

Revision History

    Version 	Description 		Section 	Status 	Date

    1.0 	Initial public release. NA		Final 	2015-October-06

Legal Disclaimer

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR 
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR 
MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE 
RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A standalone copy or paraphrase of the text of this document that omits 
the distribution URL is an uncontrolled copy and may lack important 
information or contain factual errors. The information in this document is 
intended for end users of Cisco products.

- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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                On call after hours for member emergencies only.
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